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Re: Excessive redraw of overlapping/overlapped rows?

From: David Kastrup
Subject: Re: Excessive redraw of overlapping/overlapped rows?
Date: Mon, 26 Sep 2005 21:19:32 +0200
User-agent: Gnus/5.11 (Gnus v5.11) Emacs/22.0.50 (gnu/linux)

address@hidden (Kim F. Storm) writes:

> YAMAMOTO Mitsuharu <address@hidden> writes:
>> Is it OK to not set `changed_p' for the case of mode/header line
>> updates?
> I don't know for sure , but it seems ok.

If mode line updates change the height of the mode line (because of
descenders, or images or stuff like that), it is conceivable that
something happens with the display, though likely not on all lines at
once.  Even for line number updates, if you use line numbers with a
non-constant height (old-style numerals).

So it seems like it would at least appear prudent to check whether the
mode line dimensions changed or something like that, or check just
what lines the mode line might overlap.

David Kastrup, Kriemhildstr. 15, 44793 Bochum

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